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    <title>homework1</title>
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<pre>
      # -*- coding: utf-8 -*-
def main():
 encrypt_sen = "g fmnc wms bgblr rpylqjyrc gr zw fylb. rfyrq ufyr
amknsrcpq ypc dmp. bmgle gr gl zw fylb gq glcddgagclr ylb rfyr'q ufw rfgq
rcvr gq qm jmle. sqgle qrpgle.kyicrpylq() gq pcamkkclbcb. lmu ynnjw ml rfc
spj."
 tran_map = {
 'y': 'a', 'z': 'b', 'Y': 'A', 'Z': 'B'
 }
 for alnum in range(24):
 tran_map[chr(97 + alnum)] = chr(97 + alnum + 2) # ⼩写字⺟
 tran_map[chr(65 + alnum)] = chr(65 + alnum + 2) # ⼤写字⺟
 decrypt_sen = []
 for s in encrypt_sen:
 decrypt_sen.append(tran_map[s]) if s.isalnum() else
decrypt_sen.append(s)
 print(''.join(decrypt_sen))
if __name__ == '__main__':
 main()
    </pre>
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